Sec. 21-35. Doors; windows; ventilation.

(a) General provision. Every rental housing unit should have doors and windows which provide adequate natural light and ventilation to permit normal indoor activities and at the same time support the health and safety of the occupants while providing protection from the elements and privacy for the occupants.

(b) Habitable rooms; natural light. Every habitable room within a rental housing unit shall have at least one exterior glazed opening, facing directly to the outside, to provide natural light. The total glazed area for each habitable room shall be not less than ten (10) square feet. Kitchens and kitchen areas shall not be required to meet the glazed exterior opening requirement.

(c) Habitable rooms; ventilation. Every habitable room within a rental housing unit shall have at least one openable exterior opening, vented directly to the outside air, to provide natural ventilation. The total area of openable venting for each habitable room shall be not less than five (5) square feet. Habitable rooms, except those used for sleeping, shall not be required to meet the openable exterior opening requirement if mechanical ventilation is provided. Kitchens and kitchen areas shall not be required to meet the openable exterior opening requirement if mechanical ventilation is provided.

(d) Other rooms; ventilation. Every bathroom, flush toilet room and laundry room shall have at least one openable exterior opening, vented directly to the outside air, to provide natural ventilation. The total area of openable venting shall be not less than one and one-half (1½) square feet. Bathrooms, flush toilet rooms and laundry rooms shall not be required to meet the openable exterior opening requirement if mechanical ventilation is provided.

(e) Screened openings. Any rental housing unit which is cooled by evaporative cooling and is not equipped with upducts or other similar venting, shall have at least one openable exterior opening which is screened. All required screens shall be free from tears, holes or imperfections of the frame that could admit insects and other vermin detrimental to the health of the occupants. Any screens which are provided by the owner, agent or manager shall be
maintained in sound condition and in good working order.

(f) Glazing. Glazed areas shall be soundly glazed and free from missing, loose, cracked or broken glass that is likely to injure a person, allows the elements or vermin to enter the structure, allows air escape or infiltration, or otherwise diminishes the thermal efficiency of the structure.

(g) Windows. Windows shall be maintained in sound condition. Exterior windows shall fit the window openings and shall be properly sealed or weatherstripped in a manner that prevents the entrance of the elements or vermin or excessive air escape or infiltration. The fit of exterior windows shall not otherwise diminish the thermal efficiency of the structure.

(h) Exterior doors. Exterior doors leading into rental housing units shall fit the door openings and shall also be weatherstripped in a manner that prevents the entrance of the elements or vermin or excessive air escape or infiltration. The fit of exterior doors shall not otherwise diminish the thermal efficiency of the structure. Exterior doors, garage doors, door hardware and door frames shall be maintained in sound condition and capable of the use
intended by their design. Any hollow core or solid core doors leading into rental housing units which are replaced after the effective date of this code, shall be replaced with solid core or metal wrapped doors that have a sound transmission rating at least equal to the rating of the door being replaced.

(i) Interior doors. Interior doors, door hardware and door frames shall be maintained in sound condition free from holes, breaks or cracks and capable of the use intended by their design. They shall also be capable of affording privacy to the occupants.

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A common example:

A common violation for this code is when a rental property does not have an exterior door that appropriately seals of the interior of the building. The violation in this scenario is that all rentals must have a exterior doors fitted with weather stripping so as to prevent weather and vermin from entering the building.